Finishing or sizing lathe



(No Model.) 2 Sheets-Sheet 1.

, I. MARTIN.

FINISHING 0R SIZING LATHE.

No. 463,747. Patented Nov. 24, I891.

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(No Model.) 2 Sheefis-Shet 2..

P. MARTIN. FINISHING 0R SIZING LATHE.v No. 463,747. Patented Nov. 24, 189-1.

UNITED STATES PATENT @nnrcn.

FRANK MARTIN, OF CINCINNATI, OHIO.

FINISHING OR SIZING LATHE.

-SI EGIFICATI01\T forming part of Letters Patent No. 463,747, dated November 24, 1891. Application filed February 4, 1891. $erial No. 380,254. (No model.)

To all whom it may concern:

Be it known that I, FRANK MARTIN, a citizen of the United States, residing at Cincinnati, 0hio,have invented new and useful Improvements in Sizing or Finishing Lathes, of which the following is a specification.

My invention relates to the class of lathes known as finishing or sizing lathes, such as employed in sizing piston-rods, twistdrills, and similar cylindrical objects required to be dressed to a uniform diameter through a given length; and it consists in certain features of improvement, hereinafter described and claimed, whereby the usefulness and capacity of the machine are enhanced.

Mechanism embodying my invention is illustrated in the accompany drawings, in

cross-section of the crank-wheel, showing in detail the constructive features of the adj ustable crank-wrist.

Referring now to the drawings, A designates the lathe-bed; B, the head-stock; s, the spindle; C, a chuck, and D the tail-stock with adjustable hollow center 8, all being constructed, arranged, and operated from a counter-shaft 16 in the usual manner, and therefore require no further description. To these I add additional features consisting of a sliderest carrying a dressing-wheel rotated in an opposite direction to that of the work and mechanism for reciprocating the, dressingwheel in a direction parallel, or approximately parallel, with the axis of the work. These, with their several adjustments and connections, constitute my improvements.

The slide-rest consists of a plate 1,adapted to rest upon and be secured to the lathe-bed A in the usual manner, forming a supporting guide-base for a plate 2,wl1ich is gibbed upon it to move transversely across the lathe-bed, and a plate 3, gibbed to the plate 2, so as to move at right angles to the movement of plate 2. Upon the plate 3 are two pillow-block bearings at, in and between which is journaled a short mandrel carrying a dressing-wheel 5- such, for example, as an emery-wheel-and a flanged or grooved driving-pulley 6 adjacent thereto, by which the dressing-wheel is driven by belt connections from a wide-faced driving-pulley 7 upon a counter-shaft 8 above. At one end of the plate 3, between two projecting ears or lugs, is carried at rightangles to its own line of movement a pin 9, by and upon which a pitman-rod 10 is attached pivotally to the plate 3. The opposite end of the pitman is adj ustably secured to a crank-wheel 11, carried together with the reducing and transmitting gears 12 13 14, arranged, as shown in Figs. 2 and 4, upon a rear projection b of the head-stock B and driven by a pulley 15, having belt connections with the countershaft 16.

By means of the construction thus far described the general operation of the device is effected and is as follows: The object to be dressedfor example,'a twist-drill Xis held between the lathe centers and rotated in the usual manner from the counter-shaft 16. The emery-wheel 5 (adjusted to the work, as hereinafter described) is rotated in the opposite direction by its connections from the counfer-shaft 8, and at the same time reciprocated parallel, or approximately parallel, with the axis of the drill X by the pitman 10,'driven by the crank-wheel 11 from the counter-shaft 16, pulley 15, and gear-connections 12 13 14, by which the speed is reduced and motion translated at right angles, as required. Therefore the cutting effect of the wheel 5 is distributed longitudinally upon the work, between the limits of lateral reciprocation of the dressing-wheel automatically as the operation proceeds. I

The special constructions for adjustment are as follows: The plate2 moves freely upon its supporting guide-plate 1 transversely to and from the work X, being normally held to the work by a counter-weight 17 and cord 18, passing over an idler-sheave 19, journaled at the end of plate 1. Set-screws 20 20 are arranged in the path of the plate 2, as limiting abutments to regulate the adjustment to and fro from the work, as required by varying sizes of work, or to compensate the wear of the wheel 5. A hand-lever 21, pivoted to swing horizontally on plate 1. and attached by a link 22 to plate 2, furnishes a ready means of receding the plate 2 against the normal effect of the counter-weight 17 in placing new work in the machine. The movement of the plate 2 referred to is accommodated in relation to the fixed plane of the pitman 10 by the long pin 0, before described, which retains the pitman connection, while permitting the free lateral movement of the plate 2 in relation to. said pitman.

For the purpose of varying the stroke of pitman 10 to suit the length of the work required, and also varying the relative position of the zone of reciprocatory action of the wheel 5, both the crank and its pitman are made adjustable in length. To this end the crank-wrist 23 is made adjustable by a setnut 24C in a radial slot 28 ot' the crank-wheel 11 to vary the crank length. The connection of the crank-wrist with the pitman 10 is through a sliding block 26, adjustable longitudinally upon the pitman and held by a set-screw 25. A preferable construction is shown in which the pitman 10 is longitudinally slotted, as at 27, the slot forming a guide for the block 26, which projects into it and through which the wrist-pin 23 also passes. These two adjustments enable the operator to readily adjust the Zone of action to the Work and vary the width of the zone, as required.

While I have described the ultimate action of the machine as being parallel to the axis of the work, it Will be readily seen that by suitable adjustments'of the plate 1 upon the bed (proper play being allowed for in the pitman connections) its action may be varied from parallelism, so as, for example, to give proper clearance to drills or in truing up conical belts or pins where exact fit is required, or to give a slight ftaper to the work for any purpose. The same result is accomplished by setting the lathe centers slightly out of line.

I claim as my invention and desire to secure by Letters Patent of the UnitedStates 1. In a lathe of the character indicated,the combination of the bed A, the guide-base 1, the gi'iide-platc 2, gibbed to said base to move thereon across the lathe-bed,aweight 17, connected with and normally compelling the said movement of the guide-plate, a plate or frame 3, gibbed to the plate 2 and movable thereon parallel with the lathe-bed, a rotary dressingwheel 5, carried upon said 'frame inor approximately in a parallel axis with the work to be dressed, the pitman 10, the cogged crankwheel 11, the pulley 15, and the intermediate reducing and transmitting gears, substantially as described.

2. In a lathe of the character indicated, the combination of the lathe-bed A, the guideplate 2, movable across said lathe-bed, the abutment-screws 20, the hand-lever 21, the link 22, the weight 17, the plate or frame 3, movable on the guide-plate 2, parallel with the lathe-bed and carryinga rotary dressingwheel 5, and mechanism for reciprocating said wheel-carrying frame, substantially as described.

In a lathe of the character indicated, the combination, with the reciprocable slide-rest carrying a rotary dressing-wheel, of the slotted pitman 10, the cogged crank-wheel 11, having a radial slot 28, the adjustable crankwrist 23, adjustable block 26, a driving-pulley, and intermediate transmitting and reducing gears, substantially as described.

t. In a lathe of the character indicated, the combination of the slide-rest constructed substantially as described, the pitman, and the laterally-extended pin, whereby the pitman remains pivotally connected with the reciprocatory wheelframe while permitting transverse adjustments of the latter, substantially as set forth.

5. In a lathe of the character indicated, the combination of aslide-rest adjustable to and from the work, an adjustable pitman pivotally connected with said slide-rest by.means of a laterally-extended pin, whereby atrans verse movement or adjustment of the sliderest is permitted, a crank-Wheel having a radial slot, an adjustable wrist-block, and a Wrist-pin operating in said block and adj ustable in the crank-Wheel slot, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANK MARTIN. llnesses:

L. M. HOSEA, E. Hosea. 

